Ultrafast fluorescence resonance energy transfer in a micelle

Sahu, Kalyanasis ; Ghosh, Subhadip ; Mondal, Sudip Kumar ; Ghosh, Bankim Chandra ; Sen, Pratik ; Roy, Durba ; Bhattacharyya, Kankan (2006) Ultrafast fluorescence resonance energy transfer in a micelle The Journal of Chemical Physics, 125 (4). 044714 _1-044714 _8. ISSN 0021-9606

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Official URL: http://link.aip.org/link/?JCPSA6/125/044714/1

Related URL: http://dx.doi.org/10.1063/1.2218847

Abstract

Ultrafast fluorescence resonance energy transfer (FRET) from coumarin 153 (C153) to rhodamine 6G (R6G) is studied in a neutral PEO20-PPO70-PEO20 triblock copolymer (P123) micelle and an anionic micelle (sodium dodecyl sulfate, SDS) using a femtosecond up-conversion setup. Time constants of FRET were determined from the rise time of the acceptor emission. It is shown that a micelle increases efficiency of FRET by holding the donor and the acceptor at a close distance (intramicellar FRET) and also by tuning the donor and acceptor energies. It is demonstrated that in the P123 micelle, intramicellar FRET (i.e., donor and acceptor in same micelle) occurs in 1.2 and 24 ps. In SDS micelle, there are two ultrafast components (0.7 and 13 ps) corresponding to intramicellar FRET. The role of diffusion is found to be minor in the ultrafast components of FRET. We also detected a much longer component (1000 ps) for intramicellar FRET in the larger P123 micelle.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Dyes; Polymer Blends; Colloids; Fluorescence; High-speed Optical Techniques; Diffusion
ID Code:77136
Deposited On:10 Jan 2012 05:53
Last Modified:10 Jan 2012 05:53

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